v3.26.1
RIGHT-OF-USE ASSETS - Changes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
RIGHT-OF-USE ASSETS      
Balance at beginning of year $ 349.7    
Depreciation 128.1 $ 124.0 $ 98.8
Balance at end of year 343.4 349.7  
Cost      
RIGHT-OF-USE ASSETS      
Balance at beginning of year 770.7 647.7  
Additions financed with lease obligations 122.6 158.8  
Retirement and other (82.3) (35.8)  
Balance at end of year 811.0 770.7 647.7
Accumulated depreciation      
RIGHT-OF-USE ASSETS      
Balance at beginning of year (421.0) (334.7)  
Depreciation 128.1 124.0  
Retirement and other (81.5) (37.7)  
Balance at end of year $ (467.6) $ (421.0) $ (334.7)